Update the store.proxy.data dynamically

Hi,

I have implemented Pagination using PagingMemoryProxy.
The grid also supports Drag n Drop (Self i.e re-ordering of rows is possible).

How do i update the Data in the proxy with the complete re-ordered data of the grid.?
When I try to get the data from store, I get Json data for only current page.
How do I get the entire Json data for grid to update my Proxy data?